So here’s a graph showing roasting temperatures, roasting times, and the flavor profiles you applied to each batch,” Emma said.

She had never realized just how much went into making chocolate. It wasn’t the magical mystery tour that Charlie and the Chocolate Factory promised.

“And this graph shows the region and environmental factors for each of the cacao beans that we’ve tested.”

Emma now knew more about the chocolate-making process than she ever wanted to know. It was like looking behind the wizard’s curtain and finding a man riding a bicycle to power some great illusion. Who knew that rainfall soil acidity and the time of year the cocoa pods...